Disable browser_tests on win_cross bot again.

Even with snapshots disabled, a handful of tests still fail:
https://ci.chromium.org/buildbot/chromium.clang/linux-win_cross-rel/285
(Mostly timeouts, so maybe due to snapshots not being available.)

Also, they add 30 minutes cycle time.

Bug: 495204
Change-Id: I98b4834a9f9873af5b4c03bf972ef702bd71daf4
Reviewed-on: https://chromium-review.googlesource.com/938593
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/master@{#539370}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index db43de1..9ba6512 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -352,6 +352,7 @@
     'remove_from': [
       # chromium.clang
       'CrWinAsanCov',
+      'linux-win_cross-rel',
       'ToTLinuxUBSanVptr',
       'UBSanVptr Linux',
       # chromium.fyi